Save 30-50%+ of CI time without any effort or cost. Use Magic Nix Cache, a totally free and zero-configuration binary cache for Nix on GitHub Actions.
DeterminateSystems/magic-nix-cache has 354 GitHub stars.
It currently ranks #28646 daily, #29120 weekly, #30936 monthly by momentum on Trending Repos; its best-ever rank is #5000.